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Storage engines
InnoDB
Supports transactions, row-level locking, foreign keys and encryption for tables
[ Biến | Bể bộ đệm | Trạng thái InnoDB ]
===================================== 2026-05-13 07:36:43 0x72f27c1696c0 INNODB MONITOR OUTPUT ===================================== Per second averages calculated from the last 5 seconds ----------------- BACKGROUND THREAD ----------------- srv_master_thread loops: 14829 srv_active, 0 srv_shutdown, 1449145 srv_idle srv_master_thread log flush and writes: 1463957 ---------- SEMAPHORES ---------- OS WAIT ARRAY INFO: reservation count 819146 OS WAIT ARRAY INFO: signal count 154694 RW-shared spins 14722, rounds 351009, OS waits 9980 RW-excl spins 8750, rounds 69516, OS waits 814 RW-sx spins 802, rounds 15237, OS waits 283 Spin rounds per wait: 23.84 RW-shared, 7.94 RW-excl, 19.00 RW-sx ------------ TRANSACTIONS ------------ Trx id counter 939922 Purge done for trx's n:o < 939922 undo n:o < 0 state: running but idle History list length 3 LIST OF TRANSACTIONS FOR EACH SESSION: ---TRANSACTION 407860719350624, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 407860719346408, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 407860719342192, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 407860719337976, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 407860719333760, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 407860719329544, not started 0 lock struct(s), heap size 1128, 0 row lock(s) ---TRANSACTION 407860719325328, not started 0 lock struct(s), heap size 1128, 0 row lock(s) -------- FILE I/O -------- I/O thread 0 state: waiting for i/o request (insert buffer thread) I/O thread 1 state: waiting for i/o request (log thread) I/O thread 2 state: waiting for i/o request (read thread) I/O thread 3 state: waiting for i/o request (read thread) I/O thread 4 state: waiting for i/o request (read thread) I/O thread 5 state: waiting for i/o request (read thread) I/O thread 6 state: waiting for i/o request (write thread) I/O thread 7 state: waiting for i/o request (write thread) I/O thread 8 state: waiting for i/o request (write thread) I/O thread 9 state: waiting for i/o request (write thread) Pending normal aio reads: [0, 0, 0, 0] , aio writes: [0, 0, 0, 0] , ibuf aio reads:, log i/o's:, sync i/o's: Pending flushes (fsync) log: 0; buffer pool: 0 1065786 OS file reads, 308998 OS file writes, 142192 OS fsyncs 0.20 reads/s, 16384 avg bytes/read, 0.20 writes/s, 0.20 fsyncs/s ------------------------------------- INSERT BUFFER AND ADAPTIVE HASH INDEX ------------------------------------- Ibuf: size 1, free list len 0, seg size 2, 3718 merges merged operations: insert 4923, delete mark 2071, delete 1305 discarded operations: insert 0, delete mark 0, delete 0 Hash table size 4441, node heap has 2 buffer(s) Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) Hash table size 4441, node heap has 1 buffer(s) 5.80 hash searches/s, 4.20 non-hash searches/s --- LOG --- Log sequence number 903543868 Log flushed up to 903543848 Pages flushed up to 903542609 Last checkpoint at 903542600 0 pending log flushes, 0 pending chkp writes 78549 log i/o's done, 0.20 log i/o's/second ---------------------- BUFFER POOL AND MEMORY ---------------------- Total large memory allocated 33554432 Dictionary memory allocated 258640 Buffer pool size 1003 Free buffers 737 Database pages 257 Old database pages 0 Modified db pages 3 Percent of dirty pages(LRU & free pages): 0.302 Max dirty pages percent: 75.000 Pending reads 0 Pending writes: LRU 0, flush list 0, single page 0 Pages made young 29608, not young 777571 0.00 youngs/s, 0.00 non-youngs/s Pages read 1065676, created 3834, written 209324 0.20 reads/s, 0.00 creates/s, 0.00 writes/s Buffer pool hit rate 989 / 1000, young-making rate 0 / 1000 not 0 / 1000 Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s LRU len: 257, unzip_LRU len: 0 I/O sum[160]:cur[1], unzip sum[0]:cur[0] -------------- ROW OPERATIONS -------------- 0 queries inside InnoDB, 0 queries in queue 0 read views open inside InnoDB Process ID=2507, Main thread ID=126385016256192, state: sleeping Number of rows inserted 9735, updated 23288, deleted 13989, read 15335323 0.00 inserts/s, 0.20 updates/s, 0.00 deletes/s, 6.00 reads/s Number of system rows inserted 0, updated 0, deleted 0, read 66564 0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s ---------------------------- END OF INNODB MONITOR OUTPUT ============================